Com saber qui envia mail

Com saber qui envia mail via analisis de /var/log/messages

bzcat /var/log/messages.* | grep 'from=<' | sed -e 's/.*msgid=<\(.*\)>.*/\1/g' > who_send_mail.txt

Important: per agrupar un grup: cal "escapar" els "(":

\(.*\)

El resultat es recupera via:

\1

Activar el servidor FTP en MacOSx 10.7

L'opció ha desaparescut de les preferencies...

sudo -s launchctl load -w /System/Library/LaunchDaemons/ftp.plist

Per desactivar:

sudo -s launchctl unload -w /System/Library/LaunchDaemons/ftp.plist

Per configurar mes coses: Servidor FTP Mac. Configurar ftp en Mac OSX Lion. El reto después de activarlo.

Connectar Dynamips a la xarxa real

Com combatre "206-unable to create generic ethernet NIO"

Cal fer que dynamips s'executi com root, per aixo cal canviar el propietari de l'executable i l'stiky bit.

Jo tinc el GNS3 aqui: /Applications/Xarxa/GNS3.app/Contents/Resources/dynamips-0.2.8-RC3-community-OSX.intel64.bin pero cadascu el te on vol :-D

1. Canvia el propietari root & wheel: 

% sudo chown root:wheel dynamips-0.2.8-RC2-OSX-Leopard.intel.bin 

2. Canvia el mode i l'stiky bit: 

% sudo chmod 6755 dynamips-0.2.8-RC3-community-OSX.intel64.bin

3. verifica: 

% ls -l dynamips-0.2.8-RC3-community-OSX.intel64.bin

-rwsr-sr-x  1 root  wheel  980552 Mar 14 04:28 dynamips-0.2.8-RC3-community-OSX.intel64.bin

4. Obre el GNS3 de la manera habitual, engega un router i comproba que el Dynamps s'executa com root: 

% ps auwx | grep -i dyna  
root 61647 200,4  2,9  3121052 362800 ?? R 10:29AM 2:33.42 /[...]/dynamips-0.2.8-RC3-community-OSX.intel64.bin -H 7201
root 61646 125,2  2,9  3121052 362968 ?? R 10:29AM 1:50.67 /[...]/dynamips-0.2.8-RC3-community-OSX.intel64.bin -H 7200
root 61644  99,2  1,8  2848516 227544 ?? R 10:29AM 1:16.66 /[...]/dynamips-0.2.8-RC3-community-OSX.intel64.bin -H 7202

 

 Enllaços:

• http://7200emu.hacki.at/viewtopic.php?t=6134

My Cisco Labs: GNS3 Duplex Mismatch Messages

My Cisco Labs: GNS3 Duplex Mismatch Messages: When Cisco devices are connected to one another and CDP is enabled (which it is by default), if one port is configured as full duplex but th...  

R3(config)#no cdp log mismatch duplex

IPv6 subnetting calculator

Per fi una calculadora per fer subnetting IPv6...
www.ipv6calculator.net/

DNIe & PK11 en MacOS X

3 tutorial i pagines d'ajuda per fer servir certificats PK11 i DNIe en MacOS X

• Tutorial: DNI electrónico en Mac OS X Leopard: http://www.macuarium.com/cms/index.php?id=1762&Itemid=90&option=com_content&task=view
• DNI electrónico en MacOS X Snow Leopard: http://www.bisente.com/blog/2010/04/12/dni-electronico-en-macos-x-snow-leopard/
• DNI electrónico en Mac OS X: http://www.kriptopolis.org/dni-electronico-en-macosx

nginx + PHP + FreeBSD

Investigació bibliografica per internet...

• FreeBSD: Nginx FastCGI PHP Configuration: http://www.cyberciti.biz/faq/freebsd-configure-nginx-php-fastcgi-server/
• http://www.softwareprojects.com/resources/programming/t-installing-nginx-web-server-w-php-and-ssl-1474.html
• Molt ben explicat i pas per pas: http://www.netstorming.com.ar/2010/08/01/nginx-php-fastcgi-mysql-freebsd/

Instal·lació:
[root@nginx ~]cd /usr/ports/www/nginx && make install clean
[...]
[root@nginx ~]# echo "nginx_enable="YES"" >> /etc/rc.conf


Configuració a /usr/local/etc/nginx/nginx.conf

Acceleració:
Fer servir un volum tmpfs per accelerar encara mes la cache del nginx:
Cal fer coincidir el punt de muntatge del tmpfs amb la conf del nginx on guarda la cache.

• Versio a manija:

[root@nginx ~]#mount -t tmpfs tmpfs /data/nginx/cache

• Versio automatica pesistent a reinicis:

No s'ha d'oblidar l'advertencia:

Jan  4 11:05:07 nginx kernel: WARNING: TMPFS is considered to be a highly experimental feature in FreeBSD.

Accessoris:

• Sintaxis de colors amb el vim: http://www.vim.org/scripts/script.php?script_id=1886

Instal·lar VMware tools en una VM

Es interessant instal·lar desde el repositori de la propia VMware:

I instal·lar el paquet que vulguis. Si es per un server, es recomanable el -nox-

Bibliografia:

• https://help.ubuntu.com/community/VMware/Tools
• http://www.vmware.com/pdf/osp_install_guide.pdf

Ubuntu 10.10 en un Toshiba Dynabook UX/ NB200 / NB205

Cal retocar els parametres d'arrencada del nucli que venen en el GRUB:

sudo vim /etc/default/grub

Buscar la linia
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

i canviar-la per:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nolapci_timer clocksource=jiffies"

Actualitzar el GRUB:
sudo update-grub

reboot

Altres formes:

LiveCD:

• Despres del boot, despres de la BIOS premer [ESC] per entrar al prompt del syslinux
• escriure "live intel_idle.max_cstate=0" i [enter]

Despres d'instal·lar:

• Despres del boot, despres de la BIOS, premer [shift] esquerra per tenir el prompt del GRUB
• Premer [e] per editar els parametres de boot, afegir "intel_idle.max_cstate=0" despres de "splash"
• Premer [ctrl + x] per fer el boot.

VLAN Access Control Lists (VACLs)

When you want to filter traffic that is moving from one VLAN to another, things are real CCNA-like and friendly We use an Access Control List. In fact, we should elaborate on that term a bit now in light of this discussion. We actually use a Router-based Access Control List or RACL.

But what if we want to filter traffic that is flowing within a VLAN? On no, a Router-based Access Control List cannot help us! This is when we turn to the VLAN Access Control List. To help us understand this feature, let us create a topology and a sample scenario.

NOTA: es un recordatori, cal traduir i adaptar l'article.

Suposant que volem filtrar la VLAN 55, quan s'enrouta. En el switch que fa el IVR, apliquem la llista d'acces següent:

Literatura:

• Cisco Configuring Port ACLs and VLAN ACLs
• Securing Networks with Private VLANs and VLAN Access Control List

Configurar el Syslogd del MacOS X

Editar l'arxiu /etc/syslog.conf :
Afegir
*.*                                       @192.168.1.12
o
*.*                                       @192.168.1.12:5140
si no fem servir el port estandad, i reniciar el syslogd:

Per saber si esta en marxa i enviant els logs, podem injectar algo en el syslog:

i el el servidor de syslog hem de veure:

Enabling High Performance Data Transfers

System Specific Notes for System Administrators (and Privileged Users)


These notes are intended to help users and system administrators maximize TCP/IP performance on their computer systems. They summarize all of the end-system (computer system) network tuning issues including a tutorial on TCP tuning, easy configuration checks for non-experts, and a repository of operating system specific instructions for getting the best possible network performance on these platforms

This material is currently under active revision. Please send any suggestions, additions or  corrections to us at nettune@psc.edu so we can keep the information here as up-to-date as possible.

• Introduction
• Tutorial
  • Bandwidth*Delay Products (BDP)
  • Buffers
  • Computing the BDP
• High Performance Networking Options
  • Maximum Buffer Sizes on the host
  • Socket Buffers sizes
  • Negotiating TCP Large Windows options (RFC1323)
  • TCP Selective Acknowledgments (SACK, RFC2018)
  • Path MTU
• Using Web Based Network Diagnostic Servers
  • Quick Link: NPAD Pathdiag end system and last mile diagnostics at PSC
    • Quick Link: NPAD Documentation and additional servers.
  • Quick Link: SYN Test Server
  • Quick Link: ORNL Bandwidth Tester
  • Quick Link: ANL Network Diagnostic Tool
• Detailed Procedures for System tuning and Raising network limits for:
  • FreeBSD
  • on Linux
  • on Macintosh OS X
  • on Sun Solaris Systems
  • on Windows XP
  • or on other historical Operating Systems.
• Acknowledgments

Eliminar Apple Remote Desktop

Per desinstal·lar totalment el Apple Remote Desktop, s'ha d'esborrar a manija:
Esborrar l'aplicació i


Instruccions d'Apple: Uninstalling the Administrator Software


Mes info en els Forums de suport d'Apple: http://discussions.info.apple.com/message.jspa?messageID=10056322

Si la rao d'esborrar es perque l'aplicació casca, abans de posar el SN ni obrir, cal actualitzar l'aplicació descarregant de la web l'actualitzador: http://support.apple.com/downloads/#appleremotedesktop

Exportar directoris via NFS amb Snow Leopard

Robat de: How to Share Directories over NFS with Mac OS X by Chris BeHanna, chris@behanna.org


Edita /etc/exports:

Afegeix una linia com la següent (suposant que la xarxa es 192.168):

/Users -alldirs -network 192.168.0.0 -mask 255.255.0.0

Activa nfsd:

O reinicia el nfsd:

Verifica els exports: showmount -e

Munta el directori desde una alte maquina:

Per un altre Unix, pot haver-se de fer servir la comanda mount -t nfs.

ghettoVCBg2 - Free alternative for backing up VMs in ESX(i) 3.5 and 4.x

This tool is the follow up release of the ghettoVCB backup utility which allows users to perform backups of virtual machines residing on ESX(i) 3.5+/4.x+ servers using methodology similar to VMware's VCB tool. By incorporating highly constructive feedback from the VMware  community and utilizing the existing VI API, ghettoVCB’s framework was  completely rewritten to be harder, better, faster, stronger.

The primary motivation for ghettoVCBg2 was to provide ESXi users with  access to the utility without relying on unlocking and utilizing the  unsupported console. To satisfy this requirement, the rebuilt framework  takes advantage of the

VI Perl Toolkit/vSphere SDK for Perl which is present in the

VIMA/vMA virtual appliance provided by VMware. As a result, ghettoVCBg2 provides  a more proper backup solution that administrators can utilize in their  virtual infrastructure.

• ghettoVCBg2 - Free alternative for backing up VMs in ESX(i) 3.5 and 4.x (no SSH console required!)
• vMA - vSphere Management Assistant Documentation

TextMate Bundle Management

Installing and managing TextMate bundles has always been a pain. You have to check it out from source, figure out where in the filesystem it goes, and restart TextMate.

Fortunately, someone was clever enough to make an automated solution to this problem. It handles all these cases: fetching the source, putting it in the right place, and reloading TextMate.

It’s available on GitHub as a gem, so you’d think you’d be able



Not so much. The executable the gem seems broken. Let’s install it by hand:



Now let’s see what’s available:



Lots of goodies. Let me just install a few for the stuff I regularly use…



If you happened to installed one of these in the past, you’ll need to uninstall it first.



That’s all there is to it.

By josh on technical stuff @ http://technicalpickles.com/

Estat de la memoria en FreeBSD

Necessites l'estat de la memoria per traçar amb el Cacti, amb la sortida de Linux?

Hi ha varies opcions:

i si ho hem de cridar desde un script:

Una altre opció força xula, pero la sortida no es igual a la de linux es l'script freebsd-memory:

Font de l'script:

Instal·lar Nagios en Freebsd

Instruccions per instal·lar nagios en Freebsd 8.1:

ies# cd /usr/ports/net-mgmt/nagios
ies# make install clean

Fer una ullada a:

• http://angelvg.blogspot.com/2009/07/freebsd-nagios.html

Moduls a instal·lar:

• Per graficar coses varies: http://nagiosgraph.sourceforge.net/
• Gestor PHP de la configuracio: http://www.nagiosql.org/
• Visualitzador variat: http://www.nagvis.org
• Plugin suposadament interessant, pero el site de demo dona error: http://zwhite.github.com/nboard/

Plugins:

• Per VMware i altres: https://secure.opsera.com/svn/opsview/trunk/opsview-core/nagios-plugins/
• Per les impresores Ricoh i Kyocera: http://www.ciphron.de/de/downloads.html
• Per Oracle sense el client instal·lat: http://exchange.nagios.org/directory/Plugins/Databases/Oracle/Check-Oracle-status-%26-health-without-install-Oracle-client/details

Mac Os X: Mount NFS Share / Set an NFS Client

Super ben explicat:


How do I access my enterprise NAS server by mounting NFS filesystem onto my Mac OS X based system using GUI and command line based tools?

NFS (Network File System) is the common for file sharing on NAS server and Linux / UNIX systems like, HP-UX, Solaris, Mac OS X, and others. Mac OS X can be setup as an NFS client to access shared files on the network.

Webmin en Ubuntu Server 10.4 LTS

Instal·lem les llibreries i dependències:

# aptitude -y install perl libnet-ssleay-perl openssl \

libauthen-pam-perl libpam-runtime libio-pty-perl libmd5-perl \

apt-show-versions libapt-pkg-perl

Si es queixa de libmd5-perl l'haurem d'instal·lar a ma:

Descarregar la versió mes actual des de:

http://ftp.debian.org/pool/main/libm/libmd5-perl/ 

#dpkg -i  libmd5-perl_2.03-1_all.deb

Descarregar el Webmin de http://www.webmin.com

i instal·lar:

# dpkg -i webmin_1.510-2_all.deb

El problema / Complexitat esta en les dependències i que la llibreria libmd5-perl no esta en els repositoris... 

La resta es tot normal, senzill i ràpid.